diff --git a/contrib/zeromq/test-client.cpp b/contrib/zeromq/test-client.cpp
index 159c250..f2bd213 100644
--- a/contrib/zeromq/test-client.cpp
+++ b/contrib/zeromq/test-client.cpp
@@ -33,7 +33,7 @@
     usleep(50000);
   } else {
     int value = client.get();
-    std::cout << value << std::endl;
+    std::cout << value << '\n';
   }
 
   return 0;